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Stock-Based Compensation - Components of Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Share-Based Payment Arrangement [Abstract] |  |  |  |
Equity classified awards expense | $ 3.8 | $ 2.9 | $ 12.7 | $ 8.2
Liability classified awards (credit) expense | 0.1 | 0.2 | 0.2 | (0.4)
Total stock-based compensation expense | $ 4.0 | $ 3.1 | $ 12.9 | $ 7.8

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